Question 1

Which of the following best describes the principle of descent with modification as proposed by Darwin?

Accepted Answer

Species change over generations, with inherited traits that enhance survival and reproduction becoming more common.

Question 2

Which of the following is NOT one of the four main mechanisms that drive evolution?

Accepted Answer

Artificial selection

Question 3

A population of beetles is exposed to a new pesticide. After several generations, most beetles are resistant to the pesticide. Which evolutionary mechanism is most likely responsible for this change?

Accepted Answer

Natural selection

Question 4

Which equation correctly represents the relationship between free energy change ($\Delta G$), enthalpy change ($\Delta H$), entropy change ($\Delta S$), and temperature ($T$) in a chemical reaction?

Accepted Answer

$\Delta G = \Delta H - T\Delta S$

Question 5

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

Enzymes have active sites with unique shapes that only fit specific substrates.

Question 6

A scientist is studying a protein embedded in the cell membrane. Which type of amino acid side chain is most likely to be found in the region of the protein that interacts with the hydrophobic core of the membrane?

Accepted Answer

Non-polar side chains

Question 7

Which of the following statements about DNA replication is correct?

Accepted Answer

DNA replication is semiconservative, meaning each new DNA molecule consists of one old and one new strand.

Question 8

Which of the following best distinguishes between spontaneous and non-spontaneous chemical reactions?

Accepted Answer

Spontaneous reactions have $\Delta G < 0$, while non-spontaneous reactions have $\Delta G > 0$.

Question 9

Which of the following is a key difference between DNA and RNA structure?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 10

A mutation changes a codon in a gene from UAU to UAA. What is the most likely effect on the resulting protein?

Accepted Answer

The protein will be truncated due to the introduction of a premature stop codon.

Question 11

Which of the following best describes the role of phospholipids in biological membranes?

Accepted Answer

They form a bilayer with hydrophobic tails facing inward and hydrophilic heads facing outward.

Question 12

Which of the following scenarios best illustrates gene flow as a mechanism of evolution?

Accepted Answer

A population of birds migrates to a new area and breeds with the local population, introducing new alleles.

Question 13

Which of the following best explains how competitive inhibitors affect enzyme activity?

Accepted Answer

They bind to the active site, preventing the substrate from binding.

Question 14

Which of the following is an example of artificial selection?

Accepted Answer

Breeding dogs for specific traits such as size or coat color.

Question 15

Which of the following best describes the relationship between enzyme activity and temperature?

Accepted Answer

Enzyme activity increases with temperature up to an optimal point, then decreases as the enzyme denatures.

Question 16

Which of the following best explains why changes in enzyme kinetic parameters can be used to describe the effects of inhibitors and activators?

Accepted Answer

Inhibitors and activators alter $K_m$ and $V_{max}$, which reflect changes in enzyme affinity and maximum reaction rate.

Question 17

Which of the following best describes the difference between anabolic and catabolic reactions?

Accepted Answer

Anabolic reactions build complex molecules from simpler ones, while catabolic reactions break down complex molecules.

Question 18

Which of the following best explains the semiconservative model of DNA replication?

Accepted Answer

Each new DNA molecule consists of one parental strand and one newly synthesized strand.

Question 19

Which of the following best describes the role of hydrogen bonds in the structure of DNA?

Accepted Answer

Hydrogen bonds hold complementary base pairs together between the two DNA strands.

General Biology: Core Concepts and Mechanisms Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards